我正在尝试为 Ubuntu 14.10 中的设备设置特定的蓝牙链接密钥，但我无法找到它们的存储位置。
目的是让蓝牙鼠标在 Ubuntu 和 Windows 下都可以工作，而无需在切换操作系统后重新配对。
我在 AskUbuntu 上找到的所有答案都表明密钥存储在其中，/var/lib/bluetooth/<mac_address>/linkkeys并且至少在 13.10 之前都是这种情况，但是在 14.10 中，干净的桌面安装中缺少此文件并且手动创建它没有任何效果，它被忽略蓝牙。
编辑：似乎鼠标没有发出配对请求，并且在这种情况下没有存储链接密钥。但是，在 Windows 中连接鼠标，然后在 Ubuntu 中重新启动会导致蓝牙连接失败（并且需要将鼠标移除并重新添加到蓝牙设备列表中），因此肯定会进行一些密钥交换/身份验证以防止鼠标在两个操作系统中共享。问题仍然存在，如何在连接此鼠标时强制蓝牙保存并使用保存的链接键？
硬件细节：
下面的两个日志显示，对于可配对设备（手机），密钥存储在 linkkeys 文件中；鼠标不是这种情况。我知道旧的 bluetoothd 版本也用于保存鼠标的链接键，因为在 askubuntu 和 ubuntuforums 上有很多关于将链接键从 Windows 复制到 Ubuntu 以在两个操作系统之间共享鼠标的特定目的的答案/教程。
这是鼠标发现和连接设置的蓝牙日志：
bluetoothd[15615]: plugins/mgmtops.c:mgmt_start_discovery() index 0
bluetoothd[15615]: Discovery session 0x7feb52b14130 with :1.137 activated
bluetoothd[15615]: src/adapter.c:session_ref() 0x7feb52b14130: ref=1
bluetoothd[15615]: plugins/mgmtops.c:mgmt_event() cond 1
bluetoothd[15615]: plugins/mgmtops.c:mgmt_event() Received 10 bytes from management socket
bluetoothd[15615]: plugins/mgmtops.c:mgmt_cmd_complete()
bluetoothd[15615]: plugins/mgmtops.c:start_discovery_complete() hci0 type 1 status 0
bluetoothd[15615]: plugins/mgmtops.c:mgmt_event() cond 1
bluetoothd[15615]: plugins/mgmtops.c:mgmt_event() Received 8 bytes from management socket
bluetoothd[15615]: plugins/mgmtops.c:mgmt_discovering() Controller 0 type 1 discovering 1
bluetoothd[15615]: plugins/mgmtops.c:mgmt_event() cond 1
bluetoothd[15615]: plugins/mgmtops.c:mgmt_event() Received 25 bytes from management socket
bluetoothd[15615]: plugins/mgmtops.c:mgmt_device_found() hci0 addr DE:AD:BE:EF:00:00, rssi -43 flags 0x0003 eir_len 5
bluetoothd[15615]: plugins/mgmtops.c:mgmt_confirm_name() hci0 bdaddr DE:AD:BE:EF:00:00 name_known 0
bluetoothd[15615]: plugins/mgmtops.c:mgmt_event() cond 1
bluetoothd[15615]: plugins/mgmtops.c:mgmt_event() Received 16 bytes from management socket
bluetoothd[15615]: plugins/mgmtops.c:mgmt_cmd_complete()
bluetoothd[15615]: Unknown command complete for opcode 37
bluetoothd[15615]: plugins/mgmtops.c:mgmt_event() cond 1
bluetoothd[15615]: plugins/mgmtops.c:mgmt_event() Received 61 bytes from management socket
bluetoothd[15615]: plugins/mgmtops.c:mgmt_device_found() hci0 addr DE:AD:BE:EF:00:00, rssi -43 flags 0x0000 eir_len 41
bluetoothd[15615]: plugins/mgmtops.c:mgmt_event() cond 1
bluetoothd[15615]: plugins/mgmtops.c:mgmt_event() Received 8 bytes from management socket
bluetoothd[15615]: plugins/mgmtops.c:mgmt_discovering() Controller 0 type 1 discovering 0
bluetoothd[15615]: src/adapter.c:adapter_set_discovering() hci0 restarting discovery, disc_sessions 1
bluetoothd[15615]: plugins/mgmtops.c:mgmt_start_discovery() index 0
bluetoothd[15615]: plugins/mgmtops.c:mgmt_event() cond 1
bluetoothd[15615]: plugins/mgmtops.c:mgmt_event() Received 10 bytes from management socket
bluetoothd[15615]: plugins/mgmtops.c:mgmt_cmd_complete()
bluetoothd[15615]: plugins/mgmtops.c:start_discovery_complete() hci0 type 1 status 0
bluetoothd[15615]: plugins/mgmtops.c:mgmt_event() cond 1
bluetoothd[15615]: plugins/mgmtops.c:mgmt_event() Received 8 bytes from management socket
bluetoothd[15615]: plugins/mgmtops.c:mgmt_discovering() Controller 0 type 1 discovering 1
bluetoothd[15615]: plugins/mgmtops.c:mgmt_event() cond 1
bluetoothd[15615]: plugins/mgmtops.c:mgmt_event() Received 25 bytes from management socket
bluetoothd[15615]: plugins/mgmtops.c:mgmt_device_found() hci0 addr DE:AD:BE:EF:00:00, rssi -43 flags 0x0003 eir_len 5
bluetoothd[15615]: src/adapter.c:session_unref() 0x7feb52b14130: ref=0
bluetoothd[15615]: src/adapter.c:session_remove() Discovery session 0x7feb52b14130 with :1.137 deactivated
bluetoothd[15615]: src/adapter.c:session_remove() Stopping discovery
bluetoothd[15615]: plugins/mgmtops.c:mgmt_stop_discovery() index 0
bluetoothd[15615]: Stopping discovery
bluetoothd[15615]: src/adapter.c:create_device() DE:AD:BE:EF:00:00
bluetoothd[15615]: src/adapter.c:adapter_create_device() DE:AD:BE:EF:00:00
bluetoothd[15615]: src/device.c:device_create() Creating device /org/bluez/15615/hci0/dev_DE:AD:BE:EF:00:00
bluetoothd[15615]: src/device.c:btd_device_ref() 0x7feb52b15680: ref=1
bluetoothd[15615]: src/device.c:device_set_temporary() temporary 1
bluetoothd[15615]: src/device.c:btd_device_ref() 0x7feb52b15680: ref=2
bluetoothd[15615]: plugins/mgmtops.c:mgmt_event() cond 1
bluetoothd[15615]: plugins/mgmtops.c:mgmt_event() Received 10 bytes from management socket
bluetoothd[15615]: plugins/mgmtops.c:mgmt_cmd_complete()
bluetoothd[15615]: plugins/mgmtops.c:mgmt_cmd_complete() stop_discovery complete
bluetoothd[15615]: plugins/mgmtops.c:mgmt_event() cond 1
bluetoothd[15615]: plugins/mgmtops.c:mgmt_event() Received 8 bytes from management socket
bluetoothd[15615]: plugins/mgmtops.c:mgmt_discovering() Controller 0 type 1 discovering 0
bluetoothd[15615]: plugins/mgmtops.c:mgmt_event() cond 1
bluetoothd[15615]: plugins/mgmtops.c:mgmt_event() Received 65 bytes from management socket
bluetoothd[15615]: plugins/mgmtops.c:mgmt_device_connected() hci0 device DE:AD:BE:EF:00:00 connected eir_len 46
bluetoothd[15615]: src/adapter.c:adapter_get_device() DE:AD:BE:EF:00:00
bluetoothd[15615]: src/device.c:device_probe_drivers() Probing drivers for DE:AD:BE:EF:00:00
bluetoothd[15615]: input/manager.c:hid_device_probe() path /org/bluez/15615/hci0/dev_DE:AD:BE:EF:00:00
bluetoothd[15615]: src/device.c:btd_device_ref() 0x7feb52b15680: ref=3
bluetoothd[15615]: input/device.c:input_device_new() Registered interface org.bluez.Input on path /org/bluez/15615/hci0/dev_DE:AD:BE:EF:00:00
bluetoothd[15615]: src/device.c:device_set_temporary() temporary 0
bluetoothd[15615]: src/device.c:btd_device_unref() 0x7feb52b15680: ref=2
这是手机配对的蓝牙日志（要求用户验证两个设备上显示的代码）：
bluetoothd[15615]: plugins/mgmtops.c:mgmt_start_discovery() index 0
bluetoothd[15615]: Discovery session 0x7feb52b14ca0 with :1.138 activated
bluetoothd[15615]: src/adapter.c:session_ref() 0x7feb52b14ca0: ref=1
bluetoothd[15615]: plugins/mgmtops.c:mgmt_event() cond 1
bluetoothd[15615]: plugins/mgmtops.c:mgmt_event() Received 10 bytes from management socket
bluetoothd[15615]: plugins/mgmtops.c:mgmt_cmd_complete()
bluetoothd[15615]: plugins/mgmtops.c:start_discovery_complete() hci0 type 1 status 0
bluetoothd[15615]: plugins/mgmtops.c:mgmt_event() cond 1
bluetoothd[15615]: plugins/mgmtops.c:mgmt_event() Received 8 bytes from management socket
bluetoothd[15615]: plugins/mgmtops.c:mgmt_discovering() Controller 0 type 1 discovering 1
bluetoothd[15615]: plugins/mgmtops.c:mgmt_event() cond 1
bluetoothd[15615]: plugins/mgmtops.c:mgmt_event() Received 64 bytes from management socket
bluetoothd[15615]: plugins/mgmtops.c:mgmt_device_found() hci0 addr DE:AD:BE:EF:01:01, rssi -52 flags 0x0000 eir_len 44
bluetoothd[15615]: src/adapter.c:session_unref() 0x7feb52b14ca0: ref=0
bluetoothd[15615]: src/adapter.c:session_remove() Discovery session 0x7feb52b14ca0 with :1.138 deactivated
bluetoothd[15615]: src/adapter.c:session_remove() Stopping discovery
bluetoothd[15615]: plugins/mgmtops.c:mgmt_stop_discovery() index 0
bluetoothd[15615]: Stopping discovery
bluetoothd[15615]: src/adapter.c:adapter_create_device() DE:AD:BE:EF:01:01
bluetoothd[15615]: src/device.c:device_create() Creating device /org/bluez/15615/hci0/dev_DE:AD:BE:EF:01:01
bluetoothd[15615]: src/device.c:btd_device_ref() 0x7feb52b17cd0: ref=1
bluetoothd[15615]: src/device.c:device_set_temporary() temporary 1
bluetoothd[15615]: plugins/mgmtops.c:mgmt_create_bonding() hci0 bdaddr DE:AD:BE:EF:01:01 io_cap 0x01
bluetoothd[15615]: src/device.c:bonding_request_new() Requesting bonding for DE:AD:BE:EF:01:01
bluetoothd[15615]: src/device.c:bonding_request_new() Temporary agent registered for DE:AD:BE:EF:01:01 at :1.138:/org/bluez/agent/wizard
bluetoothd[15615]: plugins/mgmtops.c:mgmt_event() cond 1
bluetoothd[15615]: plugins/mgmtops.c:mgmt_event() Received 10 bytes from management socket
bluetoothd[15615]: plugins/mgmtops.c:mgmt_cmd_complete()
bluetoothd[15615]: plugins/mgmtops.c:mgmt_cmd_complete() stop_discovery complete
bluetoothd[15615]: plugins/mgmtops.c:mgmt_event() cond 1
bluetoothd[15615]: plugins/mgmtops.c:mgmt_event() Received 8 bytes from management socket
bluetoothd[15615]: plugins/mgmtops.c:mgmt_discovering() Controller 0 type 1 discovering 0
bluetoothd[15615]: plugins/mgmtops.c:mgmt_event() cond 1
bluetoothd[15615]: plugins/mgmtops.c:mgmt_event() Received 37 bytes from management socket
bluetoothd[15615]: plugins/mgmtops.c:mgmt_device_connected() hci0 device DE:AD:BE:EF:01:01 connected eir_len 18
bluetoothd[15615]: src/adapter.c:adapter_get_device() DE:AD:BE:EF:01:01
bluetoothd[15615]: plugins/mgmtops.c:mgmt_event() cond 1
bluetoothd[15615]: plugins/mgmtops.c:mgmt_event() Received 18 bytes from management socket
bluetoothd[15615]: plugins/mgmtops.c:mgmt_user_confirm_request() hci0 DE:AD:BE:EF:01:01 confirm_hint 0
bluetoothd[15615]: src/adapter.c:adapter_get_device() DE:AD:BE:EF:01:01
bluetoothd[15615]: src/device.c:new_auth() Requesting agent authentication for DE:AD:BE:EF:01:01
bluetoothd[15615]: src/agent.c:agent_request_confirmation() Calling Agent.RequestConfirmation: name=:1.138, path=/org/bluez/agent/wizard, passkey=436733
bluetoothd[15615]: plugins/mgmtops.c:mgmt_confirm_reply() index 0 addr DE:AD:BE:EF:01:01 success 1
bluetoothd[15615]: plugins/mgmtops.c:mgmt_event() cond 1
bluetoothd[15615]: plugins/mgmtops.c:mgmt_event() Received 16 bytes from management socket
bluetoothd[15615]: plugins/mgmtops.c:mgmt_cmd_complete()
bluetoothd[15615]: plugins/mgmtops.c:mgmt_cmd_complete() user_confirm_reply complete
bluetoothd[15615]: plugins/mgmtops.c:mgmt_event() cond 1
bluetoothd[15615]: plugins/mgmtops.c:mgmt_event() Received 32 bytes from management socket
bluetoothd[15615]: plugins/mgmtops.c:mgmt_new_link_key() Controller 0 new key of type 5 pin_len 0
bluetoothd[15615]: src/adapter.c:adapter_get_device() DE:AD:BE:EF:01:01
bluetoothd[15615]: src/event.c:btd_event_link_key_notify() storing link key of type 0x05
bluetoothd[15615]: src/device.c:device_set_bonded() bonded 1
bluetoothd[15615]: src/device.c:device_set_temporary() temporary 0
bluetoothd[15615]: src/adapter.c:adapter_get_device() DE:AD:BE:EF:01:01
bluetoothd[15615]: src/device.c:device_bonding_complete() bonding 0x7feb52b2d270 status 0x00
bluetoothd[15615]: src/device.c:device_bonding_complete() Proceeding with service discovery
bluetoothd[15615]: src/device.c:btd_device_ref() 0x7feb52b17cd0: ref=2
bluetoothd[15615]: src/agent.c:agent_release() Releasing agent :1.138, /org/bluez/agent/wizard
bluetoothd[15615]: plugins/mgmtops.c:mgmt_event() cond 1
bluetoothd[15615]: plugins/mgmtops.c:mgmt_event() Received 16 bytes from management socket
bluetoothd[15615]: plugins/mgmtops.c:mgmt_cmd_complete()
bluetoothd[15615]: plugins/mgmtops.c:pair_device_complete() hci0 DE:AD:BE:EF:01:01 pairing complete status 0
bluetoothd[15615]: src/adapter.c:adapter_get_device() DE:AD:BE:EF:01:01
bluetoothd[15615]: src/device.c:device_bonding_complete() bonding (nil) status 0x00
过了一段时间，我终于解决了我面临的问题。我仍然没有找到最初问题的答案（我无法确定这个特定的 bluez/适配器/外设组合的链接密钥存储在哪里），但我确实发现 bluez 会读取链接密钥文件（如果存在），并将使用文件中的密钥。
因此，即使配对后链接密钥可能不会写入文件，也可以通过手动将它们添加到链接密钥文件来覆盖这些密钥。
正确设置密钥类型很重要，否则该密钥将被忽略。
作为参考，在我的案例中有效的密钥类型如下所示： https: //askubuntu.com/a/246791/352576